Need to restore my Dimension 8200 back to factory settings.

I need to set my Dimension 8200 back to the way it was when it was ordered. The machine is 5 years old and does not have the ability to use the ctrl + f11 key function at the Dell splash screen. I have also checked all the CD's that came with the computer and there is no one single disc that will do this.

I realize that when I do that I will be losing everything that has been installed since then including the MS updates. I am willing to take the time to put all those updates back on.